关键词: |
GLOBAL POSITIONING SYSTEM, RADIO RECEIVERS, ARTIFICIAL SATELLITES, AUDITING, POSITION(LOCATION), WEATHER, CLOCKS, ELECTRONIC EQUIPMENT, INTERNAL, RECEIVERS, FLEETS(SHIPS), COMMUNICATION AND RADIO SYSTEMS, RADIO NAVIGATION, COMPUTER PROGRAM RELIABILITY, SYSTEMS MANAGEMENT. |
摘要: |
This is one in a series of reports being issued by the Inspector General, DoD, in accordance with an informal partnership with the Chief Information Officer, DoD, to monitor DoD efforts to address the year 2000 computing challenge. The Global Positioning System (GPS) is a worldwide, satellite-based radio navigation system developed by DoD The system is able to show a user's position on or above the earth with great precision, regardless of weather conditions Dates and times are important to GPS receivers The receivers determine a position by comparing the time generated by an internal clock to the times received from the fleet of GPS satellites. The difference between the times is used by the receiver to compute its distance from the satellite and hence compute its location. |